没有从ApplicationDbContext到Microsoft.EntityFrameworkCore.DbContext的隐式引用转换。 [英] There is no implicit reference conversion from ApplicationDbContext to Microsoft.EntityFrameworkCore.DbContext

问题描述

在遵循

异常消息：

类型'WebExtractorPortalCore.Context.ApplicationDbContext'不能将
用作通用类型或方法$ b $中的类型参数'TContext' b'DbContextOptions'。从
'WebExtractorPortalCore.Context.ApplicationDbContext'到
'Microsoft.EntityFrameworkCore.DbContext'没有隐式引用转换。

解决方案

要获得一个完美的答案，我需要更多信息，但要形成错误图像，您似乎正在混用ASP.Net软件包和ASP.NETCore软件包。

您已引用 Microsoft.EntityFrameworkCore ，它是.net核心程序包，但随后引用了 Microsoft.AspNet.Identity.EntityFramework 是.net（非核心）程序包。

删除后面的程序包并引用 Microsoft.AspNetCore.Identity.EntityFrameworkCore 代替，它应该可以工作

While following the tutorial, I am getting an error when DbContextOptions<ApplicationDbContext> which is ApplicationDbContext inherit to IdentityDbContext but when I tried to inherit DbContext it works fine.

Error Screen Shot:

Exception message:

The type 'WebExtractorPortalCore.Context.ApplicationDbContext' cannot be used as type parameter 'TContext' in the generic type or method 'DbContextOptions'. There is no implicit reference conversion from 'WebExtractorPortalCore.Context.ApplicationDbContext' to 'Microsoft.EntityFrameworkCore.DbContext'.

解决方案

For a perfect answer I need more information but form the error image you seem to be mixing ASP.Net packages and ASP.NETCore packages.

You have referenced Microsoft.EntityFrameworkCore which is a .net core package but then referenced Microsoft.AspNet.Identity.EntityFramework which is a .net (not core) package.

Remove the later package and reference Microsoft.AspNetCore.Identity.EntityFrameworkCore instead and it should work

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